Cavalier of Dawn can upgrade your weaker tokens into better ones, going from a 1/1 to a 3/3, and the ability can target Adanto Vanguard and will still resolve if its indestructible
And, against decks with Red targets for this, it will feel premium Ward 3 is pretty big, and for a creature this size, it may just feel like Hexproof some games, since your opponent will need a pretty hefty removal spell to deal with it in most cases, and it will be pretty hard for your opponent to ever take it down without paying at least what you paid for the Giant
Looking at one of the games purest colors: White
They have either no need for lots of mana or they have other ways to cast their spells and generate more mana
Kona is Expected to be a Problem Many players already expect Kona, Rescue Beastie to be an issue, especially when factoring in what just got banned in Pioneer